We describe an ontology of philosophy that is designed to aid navigation through philosophical literature, including literature in the form of encyclopedia articles and textbooks and in both printed and digital forms. The ontology is designed also to serve integration and structuring of data pertaining to the philosophical literature, and in the long term also to support reasoning about the provenance and contents of such literature, by providing a representation of the philosophical domain that is oriented around what philosophical literature is about.
Keywords Ontology · PhilosophyWe take philosophy to be a field of human activity which leads to the creation of entities of a certain special kind: philosophical entities, including philosophical concepts, theories, doctrines, arguments, and methodologies. For our purposes here, what makes these entities philosophical is the fact that they are results or outcomes of philosophical activity. What makes such activity philosophical is something which, for our present purposes, can be seen as being primitive and thus undefined. Thus, we will not enter the debate as to what distinguishes philosophical entities from other entities of similar kinds (for example scientific ones). We merely assume that philosophical activity defines a domain in which we find philosophical entities, and we devote our attention to the question of what kinds of philosophical entities there are and how they are interrelated.The development of ontologies on the part of natural scientists and of knowledge system engineers has become common practice. The results of their work are used as